DSSSB 2020: Questions Based On Pressure and Thurst – 9th January 2020

Today, we are providing you the Science Questions, which help you to command over this subjects.Taught many interesting science information and add some fun in a science teaching-learning process.This section is not only important for CTET 2019 Exam i.e UPTET, REET, HTET etc. So, we will provide you the questions which will help you in preparing for Exam.

S1.Ans. (a)
Sol. Buoyancy or upthrust is an upward force exerted by a fluid that opposes the weight of an immersed object.

S2.Ans. (a)
Sol. Loss in weight of body = Weight of water (liquid) displaced by the body = Buoyant force or upthrust exerted by water (any liquid) on the body. It was Archimedes who first observed that bodies lose their weight when immersed in water.

S3.Ans. (a)
Sol. Pressure is defined as force per unit area.

S4.Ans. (d)
Sol. Archimedes’ principle is used in designing ships and submarines.

S5.Ans. (d)
Sol. The pressure exerted by the body weight depends on the surface area that comes in contact with the sand

S6.Ans. (d)
Sol. Sharp knife have less area as compared to blunt one. Therefore, sharp knife can cut well than blunt knife.

S7.Ans. (c)
Sol. if the weight of an object is equal to the upthrust acting on it then it will float if the weight of an object is less than the upthrust acting on it then it will not able to sink it will just float.
S8.Ans.(b)
Sol. Pressure is force per unit area. Thus, P = F/A

S9.Ans. (d)
Sol. Option IV. will give us a correct measure of high and low pressure on different faces like 20×30 cm will give lowest pressure and 20×15 will give highest pressure and iron has quite large weight so it will be easy for us to determine pressure and collect information.

S10.Ans. (a)
Sol. Archimedes principle states that the buoyant force is the weight of the fluid displaced. So, for a floating object on a liquid, the weight of the displaced liquid is the weight of the object.